code: def testGetImageGrayscaleValuesInRange(self):
      image_path = os.path.join(
          PREFIX_PATH, "jpeg", "testdata", "small.jpg"
      )
      image_data = convert_image_to_csv.get_image(
          27, 33, True, image_path
      )
      self.assertLessEqual(0, np.min(image_data))
      self.assertGreaterEqual(255, np.max(image_data))
  
file_path: tensorflow/tensorflow/lite/tools/convert_image_to_csv_test.py
imports: import os
  import numpy
  from tensorflow.lite.tools import convert_image_to_csv
  from tensorflow.python.framework import test_util
  from tensorflow.python.framework.errors_impl import NotFoundError
  from tensorflow.python.platform import resource_loader
  from tensorflow.python.platform import test
label_desc: Use image node_id 7 for calling the ConvertImageToCsvTest obj's underlying member method code with example usage: obj.testGetImageGrayscaleValuesInRange() without return types